Abstract
We investigate a scenario inspired by natural supersymmetry, where neutrino data is explained within a low-scale seesaw scenario. For this the Minimal Supersymmetric Standard Model is extended by adding light right-handed neutrinos and their superpartners, the R-sneutrinos. Moreover, we consider the lightest neutralinos to be Higgsino-like. We first update a previous analysis and assess to which extent does existing LHC data constrain the allowed slepton masses. Here we find scenarios where sleptons with masses as low as 175 GeV are consistent with existing data. However, we also show that the upcoming run will either discover or rule out sleptons with masses of 300 GeV, even for these challenging scenarios. We then take a scenario which is on the borderline of observability of the upcoming LHC run assuming a luminosity of 300 fb$^{-1}$. We demonstrate that a prospective international $e^+ e^-$ linear collider with a center of mass energy of 1 TeV will be able to discover sleptons in scenarios which are difficult for the LHC. Moreover, we also show that a measurement of the spectrum will be possible within 1-3 percent accuracy.
Highlights
Particle physics faces currently a somewhat paradoxical situation: on the one hand we have the Standard Model (SM) of particle physics predicting a wealth of phenomena which have been scrutinized and confirmed by various experiments
After several years of running, no sign of physics beyond the SM has been observed, with the potential exception of some anomalies related the lepton universality in the B-meson sector [10]. This clearly shows that original vanilla forms of SUSY, like the constrained minimal supersymmetric standard model (CMSSM) or gravity mediated SUSY breaking (GMSB), are not realized in nature
Such scenarios are challenging for the Large Hadron Collider (LHC) as the SM bosons decay dominantly into hadrons
Summary
Particle physics faces currently a somewhat paradoxical situation: on the one hand we have the Standard Model (SM) of particle physics predicting a wealth of phenomena which have been scrutinized and confirmed by various experiments. After several years of running, no sign of physics beyond the SM has been observed, with the potential exception of some anomalies related the lepton universality in the B-meson sector [10] This clearly shows that original vanilla forms of SUSY, like the constrained minimal supersymmetric standard model (CMSSM) or gravity mediated SUSY breaking (GMSB), are not realized in nature. We will show that there are cases where the corresponding bound can reach about 300 GeV This motivates us to investigate to which extent a prospective international linear collider (ILC), running at a center of mass energy of 1 TeV, will be able to discover such a scenario. We collect in the Appendix the information on the software used in the various stages of this investigation
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